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Undercooling And X-Ray Structural Studies Of Ti-Zr-Ni Liquids

Published online by Cambridge University Press:  11 February 2011

G.W. Lee ,
A.K. Gangopadhyay ,
K.F. Kelton ,
R.W. Hyers ,
T.J. Rathz ,
M.B. Robinson ,
J. R. Rogers ,
L. Hennet  and
S. Krishnan
G.W. Lee
Affiliation:
Physics Department, Washington University, St. Louis, MO, USA
A.K. Gangopadhyay
Affiliation:
Physics Department, Washington University, St. Louis, MO, USA
K.F. Kelton
Affiliation:
Physics Department, Washington University, St. Louis, MO, USA
R.W. Hyers
Affiliation:
University of Alabama, Huntsville, AL
T.J. Rathz
Affiliation:
NASA/ George C.Marshall Space Flight Center, Huntsville, AL, USA
M.B. Robinson
Affiliation:
University of Alabama, Huntsville, AL
J. R. Rogers
Affiliation:
University of Alabama, Huntsville, AL
L. Hennet
Affiliation:
CNRS-CRMHT, Orleans Cedex 2, France
S. Krishnan
Affiliation:
KLA-Tencor Film and Surface Technology, 160 Rio Robles, San Jose, CA 95134, USA.
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Abstract

Maximum undercooling results for the icosahedral phase (i-phase), polytetrahedral C14 Laves phase, and solid solution phases are presented as a function of composition in Ti-Zr-Ni liquids. Containerless processing was achieved using the electrostatic levitation facility located at NASA/Marshall Space Flight Center. The maximum reduced undercooling decreases with increasing icosahedral short-range order in the ordered phase. The first synchrotron x-ray diffraction data from aerodynamically levitated liquids of Ti-Zr-Ni alloys suggest an icosahedral short-range order in the liquids, supporting Frank's hypothesis, correlating icosahedral order in the liquid with the nucleation barrier to the crystal phase. The strong negative heats of mixing between Ti/Zr and Ni and their relative atomic sizes likely favor the formation of this local icosahedral order.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 754: Symposium CC – Supercooled Liquids, Glass Transition and Bulk Metallic Glasses , 2002 , CC10.5
Copyright
Copyright © Materials Research Society 2003

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References

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